Hello Cube: Getting started with O3D

// World View Projection matrix that will transform the input vertices
  // to screen space.
  float4x4 worldViewProjection : WorldViewProjection;

// input parameters for our vertex shader
  struct VertexShaderInput {
    float4 position : POSITION;
  };

// input parameters for our pixel shader
  struct PixelShaderInput {
    float4 position : POSITION;
  };

/**
   * The vertex shader simply transforms the input vertices to screen space.
   */
  PixelShaderInput vertexShaderFunction(VertexShaderInput input) {
    PixelShaderInput output;

// Multiply the vertex positions by the worldViewProjection matrix to
    // transform them to screen space.
    output.position = mul(input.position, worldViewProjection);
    return output;
  }

/**
   * This pixel shader just returns the color red.
   */
  float4 pixelShaderFunction(PixelShaderInput input): COLOR {
    return float4(1, 0, 0, 1);  // Red.
  }

// Here we tell our effect file *which* functions are
  // our vertex and pixel shaders.

// #o3d VertexShaderEntryPoint vertexShaderFunction
  // #o3d PixelShaderEntryPoint pixelShaderFunction
  // #o3d MatrixLoadOrder RowMajor